A CONDUCTIVE PARTICLE TO CONDUCTIVELY BOND CONDUCTIVE MEMBERS TO EACH OTHER, AN ANISOTROPIC ADHESIVE CONTAINING THE CONDUCTIVE PARTICLE, A LIQUID CRYSTAL DISPLAY DEVICE USING THE ANISOTROPIC CONDUCTIVE ADHESIVE, A METHOD FOR MANUFACTURING THE LIQUID CRYSTAL DISPLAY DEVICE
First Claim
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1. A conductive particle for an anisotropic conductive adhesive, comprising:
- a core particle; and
a conductive layer formed on a surface of said core particle, wherein said conductive particle has a yield point within a range of degree of deformation from 5% to 40%, a modulus of compressive deformation of said conductive particle drastically increasing at said yield point.
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Abstract
A conductive particle used for an anisotropic conductive adhesive provides an anisotropic conductive bonding between terminal electrodes without deforming a wiring pattern or the terminal electrode of a circuit board. A conductive layer is formed on a surface of a core particle of the conductive particle. The conductive particle has a yield point within a range of degree of deformation from 5% to 40% so that a modulus of compressive deformation of the conductive particle drastically increases at the yield point.
45 Citations
40 Claims
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1. A conductive particle for an anisotropic conductive adhesive, comprising:
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a core particle; and
a conductive layer formed on a surface of said core particle, wherein said conductive particle has a yield point within a range of degree of deformation from 5% to 40%, a modulus of compressive deformation of said conductive particle drastically increasing at said yield point. - View Dependent Claims (2)
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3. A conductive particle for an anisotropic conductive adhesive, comprising:
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a core particle; and
a conductive layer formed on a surface of said core particle, wherein said conductive particle shows a characteristic of a hard elastic sphere until a compression force reaches 2 gf/particle to 3 gf/particle at an ordinary temperature, and said conductive particle crushes and begins to plastically deform when the compression force reaches 2 gf/particle to 3 gf/particle. - View Dependent Claims (4)
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5. A conductive particle for an anisotropic conductive adhesive, comprising:
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a core particle made of a resin material; and
a conductive layer formed on an entire surface of said core particle, said conductive layer being formed by metal coating, wherein said core particle has a yield point within a range of a compression force from 2 gf/particle to 3 gf/particle, a modulus of compressive deformation of said conductive particle drastically increasing so that said conductive particle starts to crush and plastically deform at said yield point. - View Dependent Claims (6)
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7. An anisotropic conductive adhesive comprises:
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an insulating adhesive; and
conductive particles dispersed in said insulating adhesive, wherein each of the conductive particles comprises;
a core particle; and
a conductive layer formed on a surface of said core particle, wherein said conductive particle has a yield point within a range of degree of deformation from 5% to 40%, a modulus of compressive deformation of said conductive particle drastically increasing at said yield point. - View Dependent Claims (8, 9, 10)
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11. An anisotropic conductive adhesive comprises:
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an insulating adhesive; and
conductive particles dispersed in said insulating adhesive, wherein each of the conductive particles comprises;
a core particle; and
a conductive layer formed on a surface of said core particle, wherein said conductive particle shows a characteristic of a hard elastic sphere until a compression force reaches 2 gf/particle to 3 gf/particle at an ordinary temperature, and said conductive particle crushes and begins to plastically deform when the compression force reaches 2 gf/particle to 3 gf/particle. - View Dependent Claims (12, 13, 14)
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15. An anisotropic conductive adhesive comprises:
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an insulating adhesive; and
conductive particles dispersed in said insulating adhesive, wherein each of the conductive particles comprises;
a core particle made of a resin material; and
a conductive layer formed on an entire surface of said core particle, said conductive layer being formed by metal coating, wherein said core particle has a yield point within a range of a compression force from 2 gf/particle to 3 gf/particle, a modulus of compressive deformation of said conductive particle drastically increasing so that said conductive particle starts to crush and plastically deform at said yield point. - View Dependent Claims (16, 17, 18)
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19. A liquid crystal display device comprises:
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a liquid crystal display element having a terminal electrode for external connection, said liquid crystal display element using a resin board;
a flexible wiring board having a terminal electrode bonded to said terminal electrode of said liquid crystal display element; and
an anisotropic conductive adhesive for bonding said terminal electrode of said flexible wiring board to said terminal electrode of said liquid crystal display element, wherein said anisotropic conductive adhesive comprises;
an insulating adhesive; and
conductive particles dispersed in said insulating adhesive, wherein each of the conductive particles comprises;
a core particle; and
a conductive layer formed on a surface of said core particle, wherein said conductive particle has a yield point within a range of degree of deformation from 5% to 40%, a modulus of compressive deformation of said conductive particle drastically increasing at said yield point.
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20. A liquid crystal display device comprises:
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a liquid crystal display element having a terminal electrode for external connection, said liquid crystal display element using a resin board;
a flexible wiring board having a terminal electrode bonded to said terminal electrode of said liquid crystal display element; and
an anisotropic conductive adhesive for bonding said terminal electrode of said flexible wiring board to said terminal electrode of said liquid crystal display element, wherein said anisotropic conductive adhesive comprises;
an insulating adhesive; and
conductive particles dispersed in said insulating adhesive, wherein each of the conductive particles comprises;
a core particle; and
a conductive layer formed on a surface of said core particle, wherein said conductive particle shows a characteristic of a hard elastic sphere until a compression force reaches 2 gf/particle to 3 gf/particle at an ordinary temperature, and said conductive particle crushes and begins to plastically deform when the compression force reaches 2 gf/particle to 3 gf/particle.
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21. A liquid crystal display device comprises:
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a liquid crystal display element having a terminal electrode for external connection, said liquid crystal display element using a resin board;
a flexible wiring board having a terminal electrode bonded to said terminal electrode of said liquid crystal display element; and
an anisotropic conductive adhesive for bonding said terminal electrode of said flexible wiring board to said terminal electrode of said liquid crystal display element, wherein said anisotropic conductive adhesive comprises;
an insulating adhesive; and
conductive particles dispersed in said insulating adhesive, wherein each of the conductive particles comprises;
a core particle made of a resin material; and
a conductive layer formed on an entire surface of said core particle, said conductive layer being formed by metal coating, wherein said core particle has a yield point within a range of a compression force from 2 gf/particle to 3 gf/particle, a modulus of compressive deformation of said conductive particle drastically increasing so that said conductive particle starts to crush and plastically deform at said yield point.
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22. A conductive particle for an anisotropic conductive adhesive, comprising:
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a particle body; and
an irregularity formed on a surface of said particle body, wherein said conductive particle is provided in an insulating adhesive so as to produce the anisotropic conductive adhesive used for conductively bonding a plurality of conductive members; and
a degree of the irregularity formed on the surface of the particle body is sufficient for eliminating the insulating adhesive between said conductive particle and each of the conductive members so that said conductive particle contacts each of said conductive members when the anisotropic conductive adhesive is subjected to a predetermined pressure during a curing process of the anisotropic conductive adhesive. - View Dependent Claims (23, 24, 25)
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26. An anisotropic conductive adhesive comprises:
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an insulating adhesive; and
conductive particles dispersed in said insulating adhesive, wherein each of the conductive particles comprises;
a particle body; and
an irregularity formed on a surface of said particle body, wherein said conductive particle is provided in an insulating adhesive so as to produce the anisotropic conductive adhesive used for conductively bonding a plurality of conductive members; and
a degree of the irregularity formed on the surface of the particle body is sufficient for eliminating the insulating adhesive between said conductive particle and each of the conductive members so that said conductive particle contacts each of said conductive members when the anisotropic conductive adhesive is subjected to a predetermined pressure during a curing process of the anisotropic conductive adhesive. - View Dependent Claims (27, 28, 29)
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30. A liquid crystal display device comprises:
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a liquid crystal display element having a terminal electrode for external connection, said liquid crystal display element using a resin board;
a flexible wiring board having a terminal electrode bonded to said terminal electrode of said liquid crystal display element; and
an anisotropic conductive adhesive for bonding said terminal electrode of said flexible wiring board to said terminal electrode of said liquid crystal display element, wherein said anisotropic conductive adhesive comprises;
an insulating adhesive; and
conductive particles dispersed in said insulating adhesive, wherein each of the conductive particles comprises;
a particle body; and
an irregularity formed on a surface of said particle body, wherein said conductive particle is provided in an insulating adhesive so as to produce the anisotropic conductive adhesive used for conductively bonding a plurality of conductive members; and
a degree of the irregularity formed on the surface of the particle body is sufficient for eliminating the insulating adhesive between said conductive particle and each of the conductive members so that said conductive particle contacts each of said conductive members when the anisotropic conductive adhesive is subjected to a predetermined pressure during a curing process of the anisotropic conductive adhesive.
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31. An anisotropic conductive adhesive comprises:
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an insulating adhesive; and
conductive particles dispersed in said insulating adhesive at a dispersion density ranging from 300 pieces/mm2 to 650 pieces/mm2. - View Dependent Claims (32, 33, 34, 35)
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36. A liquid crystal display device comprises:
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a liquid crystal display element having terminal electrodes for external connection, said liquid crystal display element using a resin board;
a flexible wiring board having terminal electrodes bonded to said terminal electrode of said liquid crystal display element; and
an anisotropic conductive adhesive for bonding said terminal electrodes of said flexible wiring board to said terminal electrodes of said liquid crystal display element, wherein said anisotropic conductive adhesive comprises;
an insulating adhesive; and
conductive particles dispersed in said insulating adhesive at a dispersion density ranging from 300 pieces/mm2 to 650 pieces/mm2. - View Dependent Claims (37)
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38. A method for manufacturing a liquid crystal display device, comprising the steps of:
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preparing an anisotropic conductive adhesive comprising an insulating adhesive and conductive particles dispersed in said insulating adhesive at a dispersion density ranging from 320 pieces/mm2 to 600 pieces/mm2, said conductive particles having an average diameter of 20 μ
m; and
bonding terminal electrodes of a liquid crystal display element using a resin board to terminal electrodes of a flexible wiring board by using said anisotropic conductive adhesive and performing thermo-compression bonding. - View Dependent Claims (39, 40)
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Specification